Respiratory mask



FIG. 1 is a perspective view of a respiratory mask showing our newdesign;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof, the opposite side view being similarthereto;

FIG. 4 is a top side view thereof;

FIG. 5 is a rear side view thereof; and,

FIG. 6 is a bottom side view thereof.

The broken line showing is for illustrative purposes only and forms nopart of the claimed design.

The ornamental design for respiratory mask, as shown and described.